If you’re scraping it off I’d go with the Eternabond tape. Scrape off as much as you can, clean it well and apply the tape. Otherwise just pull off the big loose chucks and use the lap sealant. Personally, for that job, I’d get some of the 6-8” wide tape and tackle it that way.
On my rig I used the tape on the seems front and back and use the sealant around the vents/etc. I reply the sealant as cracks appear. I actually did put tape around the shower skylight as well because the prior stuff was so bad.
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1998 Country Coach Intrigue 40' Grandview #10678
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